CN113587506B - Refrigerant return-air system and refrigerating unit - Google Patents
Refrigerant return-air system and refrigerating unit Download PDFInfo
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- CN113587506B CN113587506B CN202110844111.0A CN202110844111A CN113587506B CN 113587506 B CN113587506 B CN 113587506B CN 202110844111 A CN202110844111 A CN 202110844111A CN 113587506 B CN113587506 B CN 113587506B
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 288
- 239000007788 liquid Substances 0.000 claims abstract description 158
- 238000005057 refrigeration Methods 0.000 claims abstract description 13
- 238000002309 gasification Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005457 optimization Methods 0.000 abstract description 3
- 230000001050 lubricating effect Effects 0.000 abstract description 2
- 238000005461 lubrication Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000008016 vaporization Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compressor (AREA)
Abstract
The invention relates to the technical field of refrigeration, in particular to a refrigerant gas return system and a refrigerating unit, wherein the refrigerating unit comprises the refrigerant gas return system, the refrigerant gas return system comprises a gas return system, the gas return system is used for recovering a refrigerant flowing out from a lubricating position of a compressor, the gas return system comprises a gas-liquid separator, the gas-liquid separator is provided with a refrigerant inlet, a gaseous refrigerant outlet and a liquid refrigerant outlet, the refrigerant inlet is communicated with a bearing cavity of the compressor through an exhaust pipeline, the gaseous refrigerant outlet is communicated with an inlet of the compressor through a gas return pipeline, and the liquid refrigerant outlet is communicated with the bearing cavity of the compressor through a liquid return pipeline. The air return system is distributed around the compressor without being connected with the evaporator, compared with the distribution that the evaporator is recovered by the traditional refrigerant, the structural design simplifies the pipeline distribution of the whole refrigerating unit, particularly when the compressor and the evaporator are far away from each other, the optimization effect is more obvious, the problem that the structural design of the whole pipeline is complex is effectively avoided, and the space is greatly saved.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigerant air return system and a refrigerating unit.
Background
The refrigerating units of air conditioners, refrigerators and the like are generally composed of a compressor, a condenser, an evaporator and other structures, and when the refrigerating unit works, a low-pressure gaseous refrigerant is changed into a high-temperature high-pressure gaseous refrigerant by the compressor, the high-temperature high-pressure gaseous refrigerant absorbs heat in the evaporator and circulates into the condenser to dissipate heat, so that the aim of refrigeration is fulfilled.
The compressor comprises bearings, which are key elements in the centrifugal refrigeration compressor and are used for bearing the weight of the rotor and the rotating load during operation, and the bearings need to be lubricated during operation so as to reduce friction during rotation and further reduce vibration and noise. At present, the two kinds of modes that are more commonly used are oil lubrication mode and refrigerant lubrication mode, compare in traditional oil lubrication mode, adopt refrigerant lubrication mode can prevent lubricating oil and refrigerant mixing each other, however, along with the operation of shafting, the refrigerant can partly flash into the gaseous state for the refrigerant of outflow bearing is the gas-liquid mixture attitude, need retrieve to this gas-liquid mixture attitude refrigerant.
In the prior art, the gas-liquid mixed refrigerant flowing out of the bearing is generally recycled into the evaporator, and when the distance between the compressor and the evaporator is relatively long, a long pipeline is required for connection, so that the structural design of the whole pipeline is complex.
Disclosure of Invention
The main purposes of the invention are: the utility model provides a refrigerant return-air system and refrigerating unit, aims at solving the problem that the pipeline structure of current refrigerating unit designs complicatedly.
In order to achieve the technical problem, the invention provides a refrigerant gas return system, which comprises a main circulation system, a refrigerant conveying pipeline and a gas return system, wherein the main circulation system comprises a compressor, a condenser and an evaporator, the compressor, the condenser and the evaporator are sequentially connected through a plurality of refrigerant pipelines to form a refrigerant loop, the compressor comprises a bearing and a bearing cavity for accommodating the bearing, the refrigerant conveying pipeline is communicated with the refrigerant loop and the bearing cavity to convey liquid refrigerant in the refrigerant loop to the bearing cavity, the gas return system is used for recovering the refrigerant flowing out of the bearing cavity, the gas return system comprises a gas-liquid separator, the gas-liquid separator is provided with a refrigerant inlet, a gaseous refrigerant outlet and a liquid refrigerant outlet, and the refrigerant inlet is communicated with the bearing cavity through a gas exhaust pipeline, the gaseous refrigerant outlet is communicated with the inlet of the compressor through a gas return pipeline, and the liquid refrigerant outlet is communicated with the bearing cavity through a liquid return pipeline.
Optionally, part of the structure of the return air pipeline is arranged in a bent mode; or
And a gasification device is arranged on the air return pipeline.
Optionally, a part of the structure of the return air pipeline is a U-shaped pipe structure.
Optionally, the gas return system further comprises a throttling device arranged on the liquid return pipeline.
Optionally, the throttling device is a first throttling valve (35), wherein the first throttling valve (35) is an electronic expansion valve.
Optionally, the air return system further comprises a liquid level sensor, and the liquid level sensor is used for detecting the liquid level height of the gas-liquid separator and is electrically connected with the first throttling valve.
Optionally, the refrigerant conveying pipeline is communicated with the condenser.
Optionally, one end of the liquid return pipeline is disposed at the liquid refrigerant outlet, and the other end of the liquid return pipeline is connected to the bearing cavity through a part of the refrigerant conveying pipeline.
Optionally, a refrigerant pump is disposed on the refrigerant conveying pipeline.
Optionally, the refrigerant gas return system further includes an auxiliary delivery line, and when the refrigerant pump is turned off, the refrigerant loop is communicated with the bearing cavity through the auxiliary delivery line and a part of the refrigerant delivery line.
The invention also provides a refrigerating unit which comprises the refrigerant air return system.
The invention has the beneficial effects that: the refrigerant air-return system of the refrigerating unit comprises the air-return system arranged around the compressor, and the refrigerant flowing out of the lubricating position of the compressor can be recovered through the air-return system and then conveyed to the required position of the compressor. Specifically, the gas return system includes vapour and liquid separator, exhaust pipe, return air pipeline and liquid return pipeline, the gas-liquid mixture state refrigerant that flows out compressor bearing chamber gets into vapour and liquid refrigerant through exhaust pipe and separates into gaseous state refrigerant and liquid refrigerant, gaseous state refrigerant gets into the import of compressor through the return air pipeline, liquid refrigerant flows back to the bearing chamber lubrication position of compressor again through liquid return pipeline, in order to lubricate continuously, whole gas return system sets up very rationally, can realize the separation of gaseous state refrigerant and liquid refrigerant through vapour and liquid separator, and gaseous state refrigerant and liquid refrigerant can carry the required position to the compressor respectively, satisfy the compressor normal work and lubricated demand. This refrigerant return-air system, return-air system overall arrangement do not connect the evaporimeter around the compressor, compare in the overall arrangement that traditional refrigerant retrieved the evaporimeter, and this kind of structural design has simplified the pipeline overall arrangement of whole refrigerating unit, especially when compressor and evaporimeter are separated from far away, and optimization effect is more obvious, has effectively avoided the complicated problem of whole pipeline structural design, has greatly practiced thrift the space.
Drawings
The advantages of the above and/or additional aspects of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a refrigerant return system according to the present invention;
FIG. 2 is a schematic view of another embodiment of a refrigerant return system according to the present invention;
wherein, the corresponding relations between the reference numbers and the part names in fig. 1 and fig. 2 are as follows:
11. a compressor; 12. a condenser; 13. an evaporator; 14. a refrigerant pipeline; 15. a throttling element;
21. a refrigerant conveying pipeline; 22. a refrigerant pump; 23. an auxiliary delivery line; 24. a second throttle valve;
31. a gas-liquid separator; 32. an exhaust line; 33. a gas return line; 331. a U-shaped tube structure; 34. a return line; 35. a first throttle valve; 36. a liquid level sensor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
An embodiment of the present invention provides a refrigerant air-returning system of a refrigeration unit, wherein the refrigeration unit may be a refrigerator or an air conditioner. As shown in fig. 1, the refrigerant air-return system includes a main circulation system, a refrigerant conveying pipeline 21 and an air-return system. The main circulation system is internally circulated with a refrigerant, the refrigeration purpose can be achieved through the circulating flow of the refrigerant in the main circulation system, the refrigerant conveying pipeline 21 is used for conveying the liquid refrigerant flowing in the main circulation system to a position needing lubrication for lubrication, and the air return system is used for recovering the refrigerant flowing out of the lubrication position.
In a specific embodiment, the main circulation system includes a compressor 11, a condenser 12, an evaporator 13 and a throttling element 15, the compressor 11, the condenser 12, the evaporator 13 and the throttling element 15 are sequentially connected through four refrigerant pipelines 14 and form a refrigerant loop, the compressor 11 is used for compressing a refrigerant into a high-temperature and high-pressure state, absorbing heat in the evaporator 13 and circulating the refrigerant into the condenser 12 for dissipating heat, specifically, an outlet of the compressor 11 is communicated with an inlet of the condenser 12, the throttling element 15 is disposed on the refrigerant pipeline 14 from the condenser 12 to the evaporator 13, the throttling element 15 is a capillary tube, and an outlet of the evaporator 13 is communicated with an inlet of the compressor 11. When the refrigerating unit works, low-pressure gaseous refrigerant flows to the compressor 11 through the refrigerant pipeline 14, the compressor 11 changes the low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant flows to the condenser 12 through the refrigerant pipeline 14 to be changed into high-pressure liquid refrigerant, meanwhile, a large amount of heat is released, the high-pressure liquid refrigerant is throttled and depressurized through the throttling element 15 to be changed into low-pressure liquid refrigerant, the low-pressure liquid refrigerant flows to the evaporator 13 through the refrigerant pipeline 14 to be changed into low-pressure gaseous refrigerant, meanwhile, a large amount of heat is absorbed, the refrigerating effect is achieved, and then the low-pressure gaseous refrigerant flows back to the inlet of the compressor 11 through the refrigerant pipeline 14 to achieve circulating refrigeration. In the whole refrigerating process of the refrigerating unit, a refrigerant circulates and flows among the evaporator 13, the compressor 11 and the condenser 12 through the refrigerant pipeline 14 to form a circulating refrigerant loop, the compressor 11 changes the refrigerant into a high-temperature high-pressure gaseous refrigerant, the refrigerant absorbs heat in the evaporator 13 and circulates into the condenser 12 to dissipate heat, the purpose of repeated refrigeration is achieved, and the refrigerating function of the refrigerating unit is guaranteed.
The compressor 11 includes a bearing and a bearing cavity for accommodating the bearing, the bearing is located in the bearing cavity, the rotor is sleeved on the bearing, the bearing is used as a key element in the compressor 11 and is used for bearing the weight of the rotor and the rotation load of the rotor during operation, and the bearing cavity is used for accommodating the bearing. Refrigerant conveying line 21 and refrigerant circuit and bearing chamber intercommunication to carry the liquid refrigerant in the refrigerant circuit to the bearing chamber, and then utilize the refrigerant to lubricate the bearing of bearing intracavity, reduce the friction of bearing rotation in-process, prevent that bearing or rotor etc. from taking place to damage because of the friction, moreover, the refrigerant of lubricated bearing is directly got from the refrigerant circuit, and is very convenient.
The air return system is disposed around the compressor 11, and is configured to recover the refrigerant flowing out of the bearing cavity of the compressor 11 and then deliver the refrigerant to a desired position of the compressor 11. Generally, the refrigerant flowing out of the bearing is usually in a gas-liquid mixed state, and the refrigerant in a gaseous state can be conveyed to an inlet of the compressor 11, and the refrigerant in a liquid state can be conveyed to the bearing cavity again, so that the requirements of normal operation and lubrication of the compressor 11 are met.
The refrigerant return system of the refrigerating unit comprises a main circulation system, a refrigerant conveying pipeline 21 and a return system, wherein a compressor 11, a condenser 12 and an evaporator 13 of the main circulation system are sequentially connected through four refrigerant pipelines 14 to form a refrigerant loop, and a low-pressure gaseous refrigerant is changed into a high-temperature high-pressure gaseous refrigerant by the compressor 11 during refrigeration, heat is absorbed in the evaporator 13, and is radiated in the condenser 12, so as to achieve the purpose of refrigeration, and through arranging the refrigerant conveying pipeline 21, the liquid refrigerant in the refrigerant loop can be conveyed to the bearing cavity to lubricate the bearing in the bearing cavity through the refrigerant, reduce the friction in the rotation process of the bearing, reduce the vibration and the noise, the refrigerant flowing out of the bearing cavity can be completely recovered to an air return system arranged around the compressor 11 and then conveyed to a required position of the compressor 11. This refrigerant return-air system, return-air system overall arrangement do not connect evaporimeter 13 around compressor 11, compare in the overall arrangement that traditional refrigerant retrieved evaporimeter 13, this kind of structural design has simplified the return-air pipeline 33 overall arrangement of whole refrigerating unit, especially when compressor 11 and evaporimeter 13 are separated by far away, and the optimization effect is more obvious, has effectively avoided the complicated problem of whole pipeline structural design, has greatly practiced thrift the space.
In the present embodiment, the refrigerant delivery line 21 communicates with the condenser 12. Specifically, in the present embodiment, the condenser 12 has a liquid outlet, and the compressor 11 has a liquid inlet. Therefore, the liquid refrigerant in the condenser 12 can flow out from the liquid outlet and then is conveyed into the bearing cavity through the liquid inlet by the refrigerant conveying pipeline 21, and the lubrication effect on the bearing in the bearing cavity is realized. Because the refrigerant flows through the condenser 12, under the effect of the condenser 12, the refrigerant is changed from high-temperature high-pressure gas state into high-pressure liquid state, so set up the refrigerant conveying line 21 communicated with condenser 12, can transport the high-pressure liquid refrigerant in the condenser 12 to the bearing cavity, in order to realize the lubricated effect of bearing, and the refrigerant of lubricated bearing is directly got from the condenser 12, need not additionally to dispose the structure that provides the refrigerant on the one hand, simplified the overall arrangement of whole refrigerant return-air system, on the other hand the refrigerant in the condenser 12 is the liquid refrigerant, realize the effective lubrication of bearing through the liquid refrigerant.
In the present embodiment, the gas-return system includes a gas-liquid separator 31, the gas-liquid separator 31 has a refrigerant inlet, a gaseous refrigerant outlet and a liquid refrigerant outlet, the refrigerant inlet is communicated with the bearing cavity through an exhaust pipe 32, the gaseous refrigerant outlet is communicated with the inlet of the compressor 11 through a gas return pipe 33, and the liquid refrigerant outlet is communicated with the bearing cavity through a liquid return pipe 34. Specifically, in the present embodiment, the compressor 11 further has a refrigerant outlet communicated with the bearing cavity, one end of the exhaust pipe 32 is disposed at the refrigerant outlet, the other end of the exhaust pipe 32 is disposed at the refrigerant inlet, one end of the return pipe 33 is disposed at the gaseous refrigerant outlet, the other end is disposed on the refrigerant pipe 14 between the evaporator 13 and the compressor 11 and is communicated with the inlet of the compressor 11 through a part of the refrigerant pipe 14, and one end of the return pipe 34 is disposed at the liquid refrigerant outlet, and the other end is communicated with the liquid inlet. Through setting up vapour and liquid separator 31, played the effect of separation gaseous state refrigerant and liquid refrigerant, and gaseous state refrigerant and liquid refrigerant can carry to the required position of compressor 11 respectively, satisfy compressor 11 normal work and lubricated demand. When the refrigerating unit works, a refrigerant flows into and flows out of a bearing cavity to form a circulating system, a liquid refrigerant enters the bearing, and part of the refrigerant flashes along with the rotation of a shaft system, so that the refrigerant flowing out of the bearing is in a gas-liquid mixed state, the gas-liquid mixed refrigerant is discharged from a refrigerant discharge port, then enters a gas-liquid separator 31 from a refrigerant inlet through an exhaust pipeline 32, the separation of the gas refrigerant and the liquid refrigerant is realized through the gas-liquid separator 31, the separated gas refrigerant enters an inlet of the compressor 11 through a gas refrigerant outlet through a gas return pipeline 33, and the separated liquid refrigerant flows back into the bearing cavity of the compressor 11 through a liquid refrigerant outlet through a liquid return pipeline 34 to continuously lubricate the bearing. The gas return system recovers the refrigerant flowing out of the bearing cavity into the gas-liquid separator 31, the gas-liquid separator 31 separates the gas refrigerant from the liquid refrigerant, the separated gas refrigerant enters the inlet of the compressor 11, the liquid refrigerant flows back into the bearing cavity of the compressor 11 again, and the whole gas return system is arranged around the compressor 11, so that the pipeline layout of the refrigerating unit is optimized.
It should be noted that in the present embodiment, a part of the structure of the air return pipe 33 is disposed in a curved manner, and preferably, a part of the structure of the air return pipe 33 is disposed as a U-shaped pipe structure 331. Specifically, in the present embodiment, a part of the air return line 33 is configured as a straight pipe, a part of the air return line is configured as a U-shaped pipe, and the air return line 33 in the form of the U-shaped pipe structure 331 is disposed between two air return lines 33 in the form of straight pipe structures. Because the return air pipeline 33 is partially configured as the U-shaped pipe structure 331, the gaseous refrigerant separated by the gas-liquid separator 31 passes through the U-shaped pipe structure 331 before entering the inlet of the compressor 11 to realize secondary flash evaporation, wherein the U-shaped pipe structure 331 is configured to realize refrigerant gasification as much as possible by increasing the conveying distance of the gaseous refrigerant, so that secondary flash evaporation of the refrigerant can be ensured, the purity of the gaseous refrigerant entering the inlet of the compressor 11 is improved, the cost of the whole return air system is relatively low, and in addition, the U-shaped pipe structure 331 is easy to produce and process. In another embodiment, other devices and structures for promoting the vaporization of the refrigerant may be adopted, that is, a vaporizing device is disposed on the return air pipe 33, and the vaporizing device efficiently promotes the vaporization of the refrigerant, thereby improving the purity of the gaseous refrigerant entering the inlet of the compressor 11. Alternatively, in other embodiments, the structure of the return air line 33 may be curved in a manner other than a U-shaped pipe.
It should be mentioned that, in the present embodiment, the air return system further includes a throttling device disposed on the liquid return pipe 34, the throttling device is a first throttling valve 35, wherein the first throttling valve 35 is an electronic expansion valve. Through add first choke valve 35 on liquid return pipeline 34, the liquid refrigerant export is connected to the one end of first choke valve 35, the inlet is connected to the other end of first choke valve 35, thus, make the liquid refrigerant after the separation of vapour and liquid separator 31 earlier through first choke valve 35 cooling step-down before flowing back to the bearing cavity of compressor 11, can effectively reduce the mixing, improve the purity of the liquid refrigerant that flows back to the bearing cavity of compressor 11, reduce the gaseous refrigerant volume that gets into the bearing cavity, avoid causing bearing pressure's unstability because of liquid refrigerant purity is not high, effectively protect the bearing, improve the stability and the reliability of bearing operation. Of course, in other embodiments, the first throttle valve 35 may be omitted, and the separated liquid refrigerant directly flows into the bearing cavity, or in other embodiments, other throttling devices may be used as long as the throttling and depressurizing effects can be achieved.
In this embodiment, one end of the liquid return pipe 34 is disposed at the liquid refrigerant outlet, and the other end of the liquid return pipe 34 is connected to the bearing cavity through a part of the refrigerant conveying pipe 21. Specifically, in the present embodiment, one end of the liquid return pipe 34 is disposed at the liquid refrigerant outlet, and the other end is disposed on the refrigerant conveying pipe 21 and is communicated with the refrigerant conveying pipe 21, and is communicated with the liquid inlet through a part of the refrigerant conveying pipe 21. When the refrigerating unit works, the liquid refrigerant recovered to the gas-liquid separator 31 can be sequentially conveyed into the bearing cavity from the liquid inlet through the liquid return pipeline 34 and part of the refrigerant conveying pipelines 21, namely the liquid refrigerant separated by the gas-liquid separator 31 flows back to the bearing cavity of the compressor 11 again, the liquid refrigerant in the condenser 12 is conveyed to the refrigerant conveying pipelines 21 of the bearing cavity through the shared part, the installation structure of the whole pipeline is further simplified, the liquid return pipeline 34 has the function of enabling the separated liquid refrigerant to flow back into the refrigerant conveying pipelines 21 again, and therefore lubrication of the bearings in the bearing cavity is achieved under the action of the liquid refrigerant from the condenser 12 and the liquid refrigerant from the gas-liquid separator 31.
In this embodiment, the air return system further includes a liquid level sensor 36, and the liquid level sensor 36 is used for detecting the liquid level height of the gas-liquid separator 31 and is electrically connected to the first throttle valve 35. Through setting up level sensor 36 to gather the liquid level height of the gas-liquid mixture state refrigerant in gas-liquid separator 31, wherein, opening and shutting of first choke valve 35 is controlled according to the data that level sensor 36 gathered, and concrete control mode is: the liquid level sensor 36 is arranged at a certain position of the gas-liquid separator 31, the position of the liquid level sensor 36 is not more than half of the liquid level limit height of the gas-liquid separator 31, when the liquid level height of the liquid refrigerant is lower than the position, the first throttle valve 35 is closed, when the liquid level height of the liquid refrigerant exceeds the set limit position, the first throttle valve 35 is opened, the refrigerant flows back to the bearing cavity to lubricate the bearing, the purity of the liquid refrigerant flowing back to the bearing cavity is guaranteed, and pressure instability caused by mixing of gaseous refrigerants is reduced.
In the present embodiment, the refrigerant delivery pipe 21 is provided with a refrigerant pump 22. By arranging the refrigerant pump 22, when the whole refrigerating unit initially works, the refrigerant pump 22 on the refrigerant conveying pipeline 21 can be used for pumping the refrigerant in the condenser 12 into the bearing cavity to lubricate the bearing, so that sufficient supply of the refrigerant of the bearing is ensured. When the refrigerating unit works, the refrigerant pump 22 is started, the first throttle valve 35 is opened simultaneously, and the residual liquid refrigerant of the condenser 12 and the gas-liquid separator 31 is conveyed into the bearing cavity so as to supply the refrigerant with enough flow and pressure difference to the bearing, so that the bearing is ensured to be sufficiently lubricated, the bearing is prevented from being worn, the whole structure is simple to set, and the refrigerant pump 22 can be used for better pumping the liquid refrigerant into the bearing cavity.
In another embodiment, as shown in fig. 2, the refrigerant return system further includes an auxiliary delivery line 23, and when the refrigerant pump 22 is turned off, the refrigerant loop is communicated with the bearing cavity through the auxiliary delivery line 23 and a portion of the refrigerant delivery line 21. Specifically, in this embodiment, the condenser 12 has two liquid outlets, one end of the refrigerant conveying pipeline 21 is disposed at one of the liquid outlets, the other end of the refrigerant conveying pipeline is disposed at the liquid inlet of the compressor 11, and an auxiliary conveying pipeline 23 is disposed at the other liquid outlet of the condenser 12, and the other end of the auxiliary conveying pipeline 23 is communicated with the liquid inlet through a part of the refrigerant conveying pipeline 21 where the refrigerant pump 22 is not disposed. Therefore, by arranging the auxiliary conveying pipeline 23, after the whole refrigerating unit works for a period of time, a certain pressure difference is established between the condenser 12 and the evaporator 13, bearing liquid supply can be ensured through the pressure difference, at the moment, the refrigerant pump 22 can be turned off, high-pressure liquid refrigerant in the condenser 12 passes through the auxiliary conveying pipeline 23 and then is conveyed to a bearing cavity through a part of refrigerant conveying pipelines 21, the sufficient supply of the bearing refrigerant is ensured, and the input power can be reduced and the electric energy can be saved by turning off the refrigerant pump 22. When the refrigerating unit works, before the main motor of the compressor 11 runs, the refrigerant pump 22 is started, the first throttle valve 35 is opened at the same time, the liquid refrigerant remained in the condenser 12 and the gas-liquid separator 31 is conveyed into the bearing cavity to supply the refrigerant with enough flow and pressure difference to the bearing, the bearing is ensured to be sufficiently lubricated and the bearing is prevented from being worn, after the pressure difference between the condenser 12 and the evaporator 13 is established, the liquid refrigerant in the condenser 12 can be pumped into the bearing cavity of the compressor 11 by utilizing the pressure difference between the condenser 12 and the evaporator 13 to ensure the liquid supply of the bearing, at the moment, the refrigerant pump 22 can be stopped, the first throttle valve 35 is kept opened or stopped, when the compressor is stopped, because the pressure difference between the condenser 12 and the evaporator 13 is gradually reduced, the refrigerant pump 22 is started to ensure that the liquid supply of the bearing is carried out when the main motor of the compressor 11 is in idle, after the main motor of the compressor 11 is completely stopped, the coolant pump 22 is turned off again to meet the bearing lubrication requirement. In addition, the auxiliary conveying pipeline 23 is also provided with a second throttling valve 24, and the second throttling valve 24 and the first throttling valve 35 have the same functions and can play the effects of throttling and improving the purity of the liquid refrigerant. Of course, under the condition that the auxiliary conveying pipeline 23 is not arranged as shown in fig. 1, the refrigerant pump 22 may be always in an open state when the refrigeration unit operates, so that the liquid refrigerant in the condenser 12 may be smoothly conveyed into the bearing cavity of the compressor 11, and the bearing liquid supply is ensured.
In the present embodiment, the compressor 11 is a centrifugal compressor, and the bearings in the centrifugal compressor 11 are lubricated with the refrigerant, so that the lubricating oil and the refrigerant can be prevented from mixing with each other.
The air return process of the refrigerant air return system of the present invention is further described as follows: when the refrigerating unit works, liquid refrigerant in the condenser 12 enters the bearing cavity to lubricate the bearing, part of the refrigerant flashes into gas along with the rotation of the shafting, the refrigerant in a gas-liquid mixed state flows out from the bearing cavity and is recycled to the gas-liquid separator 31 through the exhaust pipeline 32, after the refrigerant is separated by the gas-liquid separator 31, the gas refrigerant directly flows into an inlet of the compressor 11 through a part of the return pipeline 33 in the U-shaped pipe structure 331, the liquid refrigerant flows back to the bearing cavity again through the return pipeline 34 provided with the first throttle valve 35, the whole circulating system that the refrigerant flows in and flows out of the bearing cavity is realized, and therefore, the residual liquid refrigerant in the condenser 12 and the gas-liquid separator 31 can be conveyed to the bearing in the whole refrigerating unit operation process so as to supply the refrigerant with enough flow and pressure difference to the bearing, and the sufficient lubrication of the bearing is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (11)
1. A refrigerant air return system, comprising:
the main circulating system comprises a compressor (11), a condenser (12) and an evaporator (13), wherein the compressor (11), the condenser (12) and the evaporator (13) are sequentially connected through a plurality of refrigerant pipelines (14) to form a refrigerant loop, and the compressor (11) comprises a bearing and a bearing cavity for accommodating the bearing;
the refrigerant conveying pipeline (21) is communicated with the refrigerant loop and the bearing cavity so as to convey the liquid refrigerant in the refrigerant loop to the bearing cavity; and
the gas return system is used for recovering the refrigerant flowing out of the bearing cavity and comprises a gas-liquid separator (31), the gas-liquid separator (31) is provided with a refrigerant inlet, a gaseous refrigerant outlet and a liquid refrigerant outlet, the refrigerant inlet is communicated with the bearing cavity through an exhaust pipeline (32), the gaseous refrigerant outlet is communicated with an inlet of the compressor (11) through a gas return pipeline (33), and the liquid refrigerant outlet is communicated with the bearing cavity through a liquid return pipeline (34).
2. The refrigerant air return system according to claim 1, wherein a portion of the structure of the air return pipeline (33) is curved; or
A gasification device is arranged on the gas return pipeline (33).
3. Refrigerant return system according to claim 2, characterized in that part of the return air line (33) is configured as a U-tube structure (331).
4. Refrigerant air return system according to any one of claims 1 to 3, characterized in that the air return system further comprises a throttling device arranged on the liquid return line (34).
5. The refrigerant air return system according to claim 4, wherein the throttling device is a first throttling valve (35), and wherein the first throttling valve (35) is an electronic expansion valve.
6. The refrigerant air return system according to claim 5, further comprising a liquid level sensor (36), wherein the liquid level sensor (36) is used for detecting a liquid level height of the gas-liquid separator (31) and is electrically connected with the first throttle valve (35).
7. Refrigerant air return system according to claim 1, characterized in that the refrigerant conveying line (21) communicates with the condenser (12).
8. The refrigerant gas return system according to claim 7, wherein one end of the liquid return line (34) is disposed at the liquid refrigerant outlet, and the other end of the liquid return line (34) is connected to the bearing cavity through a portion of the refrigerant delivery line (21).
9. Refrigerant return system according to claim 7 or 8, characterized in that a refrigerant pump (22) is provided on the refrigerant conveying line (21).
10. The refrigerant air-return system according to claim 9, further comprising an auxiliary delivery pipe (23), and when the refrigerant pump (22) is turned off, the refrigerant loop is communicated with the bearing cavity through the auxiliary delivery pipe (23) and a part of the refrigerant delivery pipe (21).
11. A refrigeration unit comprising a refrigerant return system as claimed in any one of claims 1 to 10.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05203270A (en) * | 1992-01-27 | 1993-08-10 | Matsushita Electric Ind Co Ltd | Two-stage compression refrigeration cycle device |
| EP0766790A1 (en) * | 1994-06-21 | 1997-04-09 | Svenska Rotor Maskiner Ab | Rotary displacement compressor with liquid circulation system |
| JPH10170078A (en) * | 1996-12-05 | 1998-06-26 | Mitsubishi Electric Corp | Freezer device |
| JP2005121242A (en) * | 2003-10-14 | 2005-05-12 | Denso Corp | Refrigerating cycle device |
| KR20090132939A (en) * | 2008-06-23 | 2009-12-31 | 엘지전자 주식회사 | Oil distributor and air conditioner including the same |
| JP2010031698A (en) * | 2008-07-25 | 2010-02-12 | Tokyo Electric Power Co Inc:The | Compressor and refrigerator |
| JP2013029269A (en) * | 2011-07-29 | 2013-02-07 | Mitsubishi Heavy Ind Ltd | Supercritical-cycle heat pump |
| CN103727043A (en) * | 2014-01-03 | 2014-04-16 | 顾发华 | Two-stage centrifugal compressor and method for providing air for static pressure gas bearings of two-stage centrifugal compressor |
| CN107816823A (en) * | 2016-09-14 | 2018-03-20 | 开利公司 | Refrigeration system and its lubricating method |
| CN111219899A (en) * | 2018-11-27 | 2020-06-02 | 斯凯孚公司 | Cooling system and method for operating a cooling system |
| CN111365896A (en) * | 2018-12-26 | 2020-07-03 | 珠海格力电器股份有限公司 | Oilless bearing external cooling system with secondary supercooling function |
| CN111365907A (en) * | 2018-12-26 | 2020-07-03 | 珠海格力电器股份有限公司 | Refrigerant circulation system and refrigerating device |
| CN211116145U (en) * | 2019-09-05 | 2020-07-28 | 杭州万辰机电科技有限公司 | ORC circulation system based on static pressure air bearing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10295231B2 (en) * | 2016-11-09 | 2019-05-21 | Aktiebolaget Skf | Cooling system |
| CN107356028A (en) * | 2017-09-07 | 2017-11-17 | 广东纽恩泰新能源科技发展有限公司 | A kind of gas-liquid separator and heat pump circulating system |
| CN110579045A (en) * | 2019-09-20 | 2019-12-17 | 海信（山东）空调有限公司 | Refrigerant circulation system and air conditioner |
-
2021
- 2021-07-26 CN CN202110844111.0A patent/CN113587506B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05203270A (en) * | 1992-01-27 | 1993-08-10 | Matsushita Electric Ind Co Ltd | Two-stage compression refrigeration cycle device |
| EP0766790A1 (en) * | 1994-06-21 | 1997-04-09 | Svenska Rotor Maskiner Ab | Rotary displacement compressor with liquid circulation system |
| JPH10170078A (en) * | 1996-12-05 | 1998-06-26 | Mitsubishi Electric Corp | Freezer device |
| JP2005121242A (en) * | 2003-10-14 | 2005-05-12 | Denso Corp | Refrigerating cycle device |
| KR20090132939A (en) * | 2008-06-23 | 2009-12-31 | 엘지전자 주식회사 | Oil distributor and air conditioner including the same |
| JP2010031698A (en) * | 2008-07-25 | 2010-02-12 | Tokyo Electric Power Co Inc:The | Compressor and refrigerator |
| JP2013029269A (en) * | 2011-07-29 | 2013-02-07 | Mitsubishi Heavy Ind Ltd | Supercritical-cycle heat pump |
| CN103727043A (en) * | 2014-01-03 | 2014-04-16 | 顾发华 | Two-stage centrifugal compressor and method for providing air for static pressure gas bearings of two-stage centrifugal compressor |
| CN107816823A (en) * | 2016-09-14 | 2018-03-20 | 开利公司 | Refrigeration system and its lubricating method |
| CN111219899A (en) * | 2018-11-27 | 2020-06-02 | 斯凯孚公司 | Cooling system and method for operating a cooling system |
| CN111365896A (en) * | 2018-12-26 | 2020-07-03 | 珠海格力电器股份有限公司 | Oilless bearing external cooling system with secondary supercooling function |
| CN111365907A (en) * | 2018-12-26 | 2020-07-03 | 珠海格力电器股份有限公司 | Refrigerant circulation system and refrigerating device |
| CN211116145U (en) * | 2019-09-05 | 2020-07-28 | 杭州万辰机电科技有限公司 | ORC circulation system based on static pressure air bearing |
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|---|---|
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